In late 1997, the chambers inside the pyramid of the Pharaoh Menkaure atGiza were closed to visitors for cleaning and repair due to moisture exhaledby tourists, which raised its humidity to such levels so that salt from thestone was crystallizing and fungus was growing on the walls. A. due to moistureexhaled by tourists, which raised its humidity to such levels so that salt fromthe stone was crystallizing B. due to moisture thattourists had exhaled, thereby raising its humidity to such levels that saltfrom the stone would crystallize C. because touristswere exhaling moisture, which had raised the humidity within them to levelssuch that salt from the stone would crystallize D. because of moisturethat was exhaled by tourists raising the humidity within them to levels so highas to make the salt from the stone crystallize (E) E. because moisture exhaled by tourists had raised thehumidity within them to such levels that salt from the stone was crystallizing 此题答案是E,我只是不明白为什么E选项里的them不会出现指代不清呢?~ 请NN帮忙解释一下~!Thanks a lot~!~